I too would try to not have her completely fall asleep after the feed. I feed before a sleep most sleeps and DD is sometimes out to it and sometimes not. I take notice of the sucking and when i know it's more of a comfort suck than actually feeding i will put her to bed. If she's awake when i do this i tuck her in, give he a kiss, whisper good night and walk away. Mostly she is happy to fall asleep herself but if see needs more help, i pat, if she needs more than that i get her up and hold her.

And just a little extra note... I fell pregnant when breastfeeding DS2 and continued for a couple of months into the pregnancy. He started biting and that was it for me